8-A-Day

The free version of this app will remind you every hour throughout the day to have a glass of water until you have met your daily target of 8 glasses. It will send a notification at the end of the day telling you how many glasses of water you had.
The premium version allows you to calculate your daily water target, customise your glass size, and specify the start and end times for the daily reminders. It provides historical data so you can track if you've been reaching your target each day. It also comes with android wear connectivity.

Please note the power saving mode on some Sony devices has been known to cause some issues with timing of reminders. We believe we have fixed this issue, but let us know if you experience any further issues.